如何為 網頁瀏覽器控制主機處理指令碼錯誤

http://support.microsoft.com/kb/261003

當其中一個指令碼引擎遇到未處理的錯誤時，它將轉寄到 網頁瀏覽器控制項，然後查詢以查看容器已經實現了宿主其容器的錯誤。如果容器已實現宿主，web
瀏覽器控制項調用CGID_DocHostCommandHandler （這在 Mshtmhst.h 檔案中定義） 的命令組 ID 和OLECMDID_SHOWSCRIPTERROR的命令 ID 的IOleCommandTarget::Exec方法。如果主機不會返回S_OK，MSHTML 顯示預設的"此頁上出現錯誤"錯誤資訊。

下面的代碼示範如何?文件物件模型中檢索資訊時此命令 id 的處理常式。此代碼不會說明了錯誤處理。

注： 如果使用者已清除在 Internet 選項 下的 進階 選項卡中的 禁用指令碼調試 複選框，將不會調用此方法。

   STDMETHODIMP CMyBrowser::Exec( const GUID* pguidCmdGroup, DWORD nCmdID,      DWORD nCmdexecopt, VARIANTARG* pvaIn, VARIANTARG* pvaOut )   {      HRESULT hr = S_OK;      if (pguidCmdGroup && IsEqualGUID(*pguidCmdGroup, CGID_DocHostCommandHandler))      {                  switch (nCmdID)          {                  case OLECMDID_SHOWSCRIPTERROR:         {            IHTMLDocument2*             pDoc = NULL;            IHTMLWindow2*               pWindow = NULL;            IHTMLEventObj*              pEventObj = NULL;            BSTR                        rgwszNames[5] =                                         {                                            SysAllocString(L"errorLine"),                                           SysAllocString(L"errorCharacter"),                                           SysAllocString(L"errorCode"),                                           SysAllocString(L"errorMessage"),                                           SysAllocString(L"errorUrl")                                        };            DISPID                      rgDispIDs[5];            VARIANT                     rgvaEventInfo[5];            DISPPARAMS                  params;            BOOL                        fContinueRunningScripts = true;            int                        i;            params.cArgs = 0;            params.cNamedArgs = 0;            // Get the document that is currently being viewed.            hr = pvaIn->punkVal->QueryInterface(IID_IHTMLDocument2, (void **) &pDoc);            // Get document.parentWindow.            hr = pDoc->get_parentWindow(&pWindow);            pDoc->Release();            // Get the window.event object.            hr = pWindow->get_event(&pEventObj);            // Get the error info from the window.event object.            for (i = 0; i < 5; i++)             {                 // Get the property's dispID.               hr = pEventObj->GetIDsOfNames(IID_NULL, &rgwszNames[i], 1,                        LOCALE_SYSTEM_DEFAULT, &rgDispIDs[i]);               // Get the value of the property.               hr = pEventObj->Invoke(rgDispIDs[i], IID_NULL,LOCALE_SYSTEM_DEFAULT,                       DISPATCH_PROPERTYGET, &params, &rgvaEventInfo[i],NULL, NULL);               SysFreeString(rgwszNames[i]);            }            // At this point, you would normally alert the user with             // the information about the error, which is now contained            // in rgvaEventInfo[]. Or, you could just exit silently.            (*pvaOut).vt = VT_BOOL;            if (fContinueRunningScripts)            {               // Continue running scripts on the page.               (*pvaOut).boolVal = VARIANT_TRUE;            }            else            {               // Stop running scripts on the page.               (*pvaOut).boolVal = VARIANT_FALSE;            }             break;         }         default:            hr = OLECMDERR_E_NOTSUPPORTED;            break;         }      }      else      {         hr = OLECMDERR_E_UNKNOWNGROUP;      }      return (hr);   }

如何重寫的 MFC 控制項容器介面方法看這裡：http://blog.csdn.net/mail_cm/article/details/7817624